Filter frame



FIG. 1 is a top perspective view of a filter frame of the present invention;

FIG. 2 is a top plan view of the filter frame;

FIG. 3 is a detailed top plan view of the filter frame;

FIG. 4 is a bottom plan view of the filter frame;

FIG. 5 is a detailed bottom plan view of the filter frame;

FIG. 6 is an elevation view showing the front and back of the filter frame;

FIG. 7 is an elevation view showing both sides of the filter frame; and,

FIG. 8 is a detailed cutaway view of the side of the filter frame showing five representative ridges corresponding to the five rightmost ridges in FIG. 7.

The dash dot lines in FIGS. 3 and 5 show breakaways and form no part of the claimed design. 

The ornamental design for a filter frame, as shown and described. 